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Subject
- Machinery.[remove]22
- Engineering.3
- Factories.3
- Manufacturing processes.3
- Earthmoving machinery.2
- Actresses.1
- Blizzards.1
- Canals.1
- Cement.1
- Construction workers--United States.1
- Cranes, derricks, etc.1
- Curtiss CW-20 (Transport plane)1
- Damages.1
- Dams--Design and construction.1
- Deserts.1
- Dredging.1
- Dwarfs.1
- Electric generators.1
- Fires.1
- Fourdrinier, Henry, 1766-1854.1